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TIME-RESOLVED UV SPECTROSCOPY OF BE URSAE MAJORIS.

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© 1985. The Astronomical Society of the Pacific. All rights reserved. Printed in U.S.A.
, , Citation J. B. Hutchings and A. P. Cowley 1985 PASP 97 328 DOI 10.1086/131539

1538-3873/97/590/328

ABSTRACT

Far-ultraviolet spectra have been obtained of the eclipsing, hot subdwarf binary, BE UMa, with phase coverage in the 2.3-day orbital period concentrated near minimum light. No clearly phase-related spectral changes were found, but the UV continuum appeared to be in a highly variable state, with changes of a factor of two occurring on a time scale of hours. The hot star in this system may be one of the few known PG 1159-035 variables, which show nonradial pulsations. If so, this is the first such star known in a binary system and thus should be important for determining the physical properties of these stars.

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10.1086/131539